The attacker apparently was enraged when his sister's boyfriend smeared some cake on the young woman's face at a gathering in a home in the 3600 block of Fairmount Avenue about 10:55 p.m. Saturday, San Diego police Officer David Stafford said.

The boyfriend, who is in his 20s, and two other young men were taken to a hospital to be treated for their wounds, he said.

Police apparently know who the attacker is, but he had fled by the time officers arrived.

His name was not released. No further description of the man was immediately available.

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